激光熔覆原位合成TiC/Ti复合材料试验研究

利用激光熔覆技术，在工业纯钛表面原位合成了TiC／Ti复合材料。结果表明：选择不同的激光熔覆工艺参数，可使碳粉和Ti粉通过原位合成反应在钛表面生成TiC／Ti复合材料熔覆层；激光功率和扫描速率是影响熔覆层质量的主要因素：激光功率越大，形成的增强相颗粒尺寸越大，相应合金元素氧化也越严重；扫描速率越大，Ti与C的作用时间变短，增强相颗粒尺寸越细小，且增强相所占的体积分数也相应减少。用XRD、DES和SEM证明了TiC颗粒的存在，同时发现颗粒分布具有一定的均匀性，原位生成的TiC颗粒主要以等轴状和块状两种形态存在。

Investigation of In-Situ TiC/Ti Metal Matrix Composite Fabricated by Laser Cladding

TiC/Ti metal matrix composite was prepared by in-situ fabrication through laser surface melting.The results show that laser surface melting can be used for the formation of TiC particles,provided a surtable set of processing parameters and the ratio of Ti to C are well selected.The energy and scanning speed of laser beam are the main factors when synthesizing TiC/Ti surface composite.The higher the laser power,or the slower the scanning rate,the bigger the size of TiC particles.But over-burning is found when high-temperature cladding was applied.When the in-situ reaction time of Ti with C is shortened,the volume fraction of TiC particles in the composite is reduced.The existence of TiC particles is testified by means of scanning electronic microscope(SEM),energy disperse spectrum(EDS),X-ray diffraction(XRD).And it was found that the distribution of TiC particles is homogeneous to some extent.The configuration of in-situ TiC particles is mainly equiaxial and block-like.